Hmm... my advice... well, I suppose the best you could do is be there for her. I was reading this pamphlet my mom had after my grandfather died (that's one of the moments where I've cried the hardest), and it said that saying "______ had gone to a better place" is not really the best thing to say to someone who's mourning. So, yeah, just be there for her, and when she's comfortable, she'll talk to you. Sometimes words don't mean as much as actions, ne? She'll most likely be glad that you were there for her the whole way while she was crying, sad, etc.
Gomen ne. This is the only advice I can give right now, since I'm really stressed and my worries have practically consumed me.